2011

Table Of Contents
text and blocks so that their size or scale measures in feet rather than
meters.
If you do not select this option, AutoCAD Map 3D does not adjust the size
or scale of text and block objects. For example, if you have a block that is
5 meters long in the source drawing, it will be 5 feet long when you bring
it into the current drawing.
Do not change this setting after you bring objects into the current drawing,
or you might introduce unintended changes to text and blocks when you
save them back to their source drawings.
For Map Distortion Use this option to adjust the size and scale of text
and blocks to correct for map distortion introduced when you represent
a spherical object (earth) in a Cartesian coordinate system.
For example, two objects, located at the northern and southern extremes
of a map, of equal length in coordinate system X remain the same length
when transformed to coordinate system Y.
If you do not select this option, AutoCAD Map 3D scales the two objects
to different lengths in coordinate system Y according to the relative map
distortion (or grid scale factor).
For Map Distortion in the Adjust Sizes And Scales area is available only if
you selected the previous option, For Changes In Units.
Coordinate Transformation Adjustments: Adjust Rotations area
Set any of the following options:
For Map Distortion Adjusts the angle of text and blocks to correct for
map distortion due to the convergence angle (the deviation of the Y axis
of a Cartesian coordinate system from true north).
For Zero-Rotation Objects Specifies that text and blocks that have a
rotation value of zero in the source drawing are adjusted to correct
distortion due to the convergence angle.
If you select this option, AutoCAD Map 3D calculates the convergence
angle for text and blocks with a zero rotation value. If you do not select
this option, AutoCAD Map 3D does not rotate text and blocks with a zero
rotation value, even if there is a convergence angle.
For Zero-Rotation Objects is available only if you selected the previous
option, For Map Distortion, in the Adjust Rotations area.
224 | Chapter 2 Setting Up